| Autor: |
Mardani, Neda, Boswood, Paul K., Youkai Li, Naderi, Nick, Atkinson, Alex |
| Předmět: |
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| Zdroj: |
EA National Conference Publications; 2023, p233-239, 7p |
| Abstrakt: |
The Queensland Government has adopted an all-hazards approach to emergency management. This includes an understanding of the potential for tsunami inundation hazard along the Queensland coast. To assist disaster management and planning, the Department of Environment and Science (DES) has been undertaking a series of tsunami inundation modelling studies since 2011 to understand this hazard. The latest study for the City of Gold Coast is the last to capture the southeast Queensland Coast (SEQ) from Hervey Bay to Gold Coast. This project employs hypothetical tsunami events for various average return intervals (ARI) from Geoscience Australia's (GA) revised probabilistic tsunami hazard assessment (PTHA18) event database. A set of tsunami scenarios originating from seven subduction source zones was selected from the PTHA18, with ARIs defined based on deep-water tsunami amplitudes offshore of the Gold Coast. Hydrodynamic modelling was carried out using DHI's MIKE 21 flexible mesh software. A model was developed for the coastal area between Double Island Point in the north to Yuraygir National Park in the south. The study area extends from South Stradbroke Island to Dreamtime Beach, including both the coastline and waterways. The model was validated against the 2007 Solomon Island tsunami event. The scenarios exhibit tsunami arrival times along the coast (depth of 5 m below the still water level) that vary between 3.5 to 18 hours based on the source location, with an extra 0.5 to 2 hours for the leading wave to reach locations situated within the waterways. Model outputs suggest that tsunamis with longer wave periods cause less attenuation upstream in waterways. There is little inundation on the coast for the 100 and 500-yr ARI events, increasing substantially for the 10,000-yr ARI at the highest astronomical tide. With consideration of previous studies for SEQ and acknowledgement of the different methodologies adopted for these studies, the current study suggests that the hazard for populated areas is greatest for the Gold Coast. Overall, the study provides planners and disaster managers with a better understanding of the potential tsunami hazard within the Gold Coast. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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